JPS585898Y2 - solar water heating device - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a solar water heating system that utilizes solar radiation heat from the sun.More specifically, while circulating water between the collector and the heat storage tank, This relates to a circulating solar water heating system that increases the temperature of water.

A so-called circulating solar water heating system forms a closed channel between a collector and a heat storage tank, and while water is circulated between them, the solar heat received by the collector is used to increase the temperature of the water in the heat storage tank. It is something that accumulates.

In this water heating device, the water temperature in the collector and the heat storage tank are compared, and the water is circulated only when the temperature on the collector side is high and the temperature difference is greater than a preset temperature difference. As a result, the device is operated only when the collector is collecting heat.

The most difficult problem with this type of solar water heater is how to extract the hottest water out of the hot water stored in the heat storage tank and supply it with hot water.

In order to extract the hottest water, it is necessary to draw hot water from near the surface of the hot water in the heat storage tank, but since the water level in the heat storage tank constantly fluctuates due to hot water supply and water supply, It is difficult to collect hot water from nearby.

For this reason, in the past, in order to draw hot water even when the water level in the heat storage tank was low, a hot water sampling port was installed near the bottom of the same type, and hot water was drawn from there. This results in drawing water at the lowest temperature in the heat storage tank.

Therefore, a hot water sampling port is installed at the top of the heat storage tank, and in order to maintain a water level higher than the hot water sampling port, a valve on the hot water supply side and a valve on the water supply side are linked, and at the same time as hot water is supplied, that amount of water is supplied to the thermal storage tank. ing.

However, this means that the hot water that has been heated has to be buried in water, and especially when the collector is not collecting heat, the water temperature in the heat storage tank will drop rapidly, resulting in only extremely low temperature water being able to be supplied. becomes.

This idea was made to solve the problems with conventional solar water heaters, and by applying special measures to the hot water taken from the heat storage tank and the water supply to the same kind,
This makes it possible to effectively utilize high-temperature hot water.

The configuration of this invention will be explained in detail below based on an illustrated embodiment.

As shown in FIG. 1, the heat storage tank 1 is formed as a sealed container made of plastic or the like and insulated from the public area. and 3, and hot water supply piping 4 are connected.

The primary side water supply pipe 2 connected to the lower part of the heat storage tank 1 includes:
- The secondary valve 5 and the secondary valve 6 are connected in series.

Water supply flows 1 to 9 suspended from the lid 7 of the heat storage tank 1 via springs 8 are connected to the secondary valve 6.
When the heat storage tank 1 is sufficiently filled with water, the valve 6 closes.
When the water level is lower than that, the valve opens six times.

Again, a ball tap 10 is connected to the secondary side water supply pipe 3 connected to the lower part of the heat storage tank 1, and this ball tap 10 opens only when the water level in the heat storage tank 1 falls below a certain water level. This is to maintain the minimum water level.

A flexible hot water sampling pipe 11 is connected to the hot water supply pipe 4,
This is in a state where it can move freely within the heat storage tank 1.

As shown in FIG. 2, the hot water sampling port 12 at the tip of the hot water sampling pipe 11 is given buoyancy by a hot water sampling float 13 so that the port 12 is always near the water surface.

Further, a hot water supply pump 14 and a hot water supply valve 15 are connected to this hot water supply pipe 4, and when the hot water supply pump 14 is driven,
Hot water in the heat storage tank 1 is supplied to a desired hot water supply location.

Inside the heat storage tank 1, a cylindrical guide 16 having a through hole or slit or the like and through which water can freely pass from the circumferential surface up and down is installed approximately vertically. As shown in FIG. 2, a floating water float 17 is housed so as to be movable up and down.

A water pipe 19 having a circulation pump 18 is connected to the lower part of the heat storage tank 1, and this water pipe 19 is connected to the collector 2.
Connected to the bottom of 0.

Further, a water ring pipe 22 having a water drain valve 21 is connected to the upper part of the collector 20, and the tip of the water ring pipe 22 is introduced into the same kind 1 from the upper part of the heat storage tank 1, and the water ring float 17 is introduced into the heat storage tank 1 from the upper part. It is facing above.

A temperature sensor 23.2 is installed in the heat storage tank 1 and the collector 20, respectively.
4 are installed, and these sensors 23 and 24 measure the
When the difference between the temperature on the collector 20 side and the temperature on the heat storage tank 1 side is larger than a preset temperature θ (θ≧0), the controller I roller 25 drives the circulation pump 18 to supply water. Water is circulated between the heat storage tank 1 and the collector 20 through a closed channel formed by the pipe 19 and the water ring pipe 22.

Further, the primary valve 5 of the hot water supply pipe 2 is connected to the circulation pump 1.
8, and is opened only when the circulation pump 18 is driving, that is, only when water is circulating between the heat storage tank 1 and the collector 20.

Next, the operation of this water heating device will be explained. First, when the heat storage tank 1 is filled with water and the collector 20 receives solar radiation and begins to collect heat, the temperature sensor 2
Since there is a temperature difference between the pumps 3 and 24, the circulation pump 18 starts to operate.

By driving the circulation pump 18 , the water in the lower part of the heat storage tank 1 is sent to the collector 20 , where it is heated by direct radiation, and then returned to the heat storage tank 1 via the water ring pipe 22 .

As shown in FIG. 2, the hot water poured into the heat storage tank 1 from the tip of the ring water pipe 22 is first poured onto the ring water flow (17), and then
Since the water escapes from here to the outside of the guide 16, the upper and lower layers within the heat storage tank 1 are not stirred, and relatively high temperature water and low temperature water are separated into upper and lower layers within the same type 1.

In this way, as long as the collector 20 is collecting heat, water is circulated between the heat storage tank 1 and the collector 20, and the temperature of the water in the heat storage tank 1 is increased overall. .

On the other hand, when the collector 20 is not irradiated with solar radiation and heat collection stops, such as at night or on a cloudy day, the temperature difference between the temperature sensors 23 and 24 becomes smaller than the preset temperature difference (including negative cases). , the circulation pump 18 is stopped and ice circulation is stopped.

When the water circulation stops, the drain valve 21 opens and the collector 2
Water is removed from the inside of the collector 21 and damage to the collector 21 due to freezing is prevented.

Next, when the water in the heat storage tank 1 has been warmed to a certain extent, if the water supply pump 14 is driven as necessary, the hot water sampling pipe 1
1, the highest temperature water near the water surface is supplied to a desired hot water supply point.

When the water in the heat storage tank 1 drops below a certain level due to hot water supply, the secondary valve 6 of the water supply pipe 2 on the negative side opens, but when the circulation pump 18 is stopped, the secondary valve 5 opens. It is closed and water is not supplied to the heat storage tank 1.

Therefore, when the collector 20
When heat collection is not being performed, the hot water in the heat storage tank 1 is not filled with water, and water at a relatively high temperature can be continued to be supplied until the same type 1 reaches the abbreviation.

However, as in the case of long-term rainy weather, the collector 20 does not collect heat for a long period of time, so if the hot water in the heat storage tank 1 becomes low, the secondary side water supply pipe The ball tap 10 of No. 3 is opened and water is supplied to ensure the minimum water level.

On the other hand, when heat is collected by the collector 20 during the daytime, as in the case of clear weather, the control valve 5 opens in conjunction with the drive of the circulation pump 18, and the water supply float 9
Water is supplied to the heat storage tank 1 until the water supply valve 6 is closed.

As explained above, according to this invention, regardless of the water level in the heat storage tank 1, the hottest water near the water surface can be extracted and supplied.

Furthermore, water is supplied to the heat storage tank 1 only when heat is being collected by the collector 20, so when heat is not being collected, such as at night or on cloudy days, the heated water can be supplied to the heat storage tank 1. This allows for a constant supply of high-temperature water without having to bury the water.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of this invention, and FIG. 2 is an explanatory diagram of the main part thereof. 1... Heat storage tank, 2... Water supply piping, 4.
...Hot water piping, 5...-Next valve, 6.
...Secondary valve, 11...Hot water sampling pipe,
12...Hot water intake, 16...Guide, 1
7... Circulating water float, 20... Collector, 22... Circulating water pipe.

Claims (1)

[Scope of utility model registration request] 1. A closed channel is formed between the collector and the heat storage tank, and the temperatures of the collector and the heat storage tank are compared, and only when the temperature difference is greater than a preset temperature difference, water is drawn between the collector and the heat storage tank. In a solar hot water system that circulates water, a flexible hot water sampling pipe connected to the hot water supply piping is
The pipe is placed so that it can freely move within the heat storage tank, and the pipe is placed near the water surface to provide buoyancy, and the water supply pipe is only installed when the water level in the heat storage tank is below a specified water level. A solar water heating system that connects in series a secondary valve that opens and a primary valve that opens only when water is circulating between the collector and the heat storage tank. 2. Guides that allow water to flow freely from the circumferential surface are installed vertically in the heat storage tank, and a floating water float is placed on this guide so that it can move up and down, and the tip of the water circulating pipe from the collector is placed on the guide. The solar water heating device according to claim 1, wherein the solar water heater faces above the float.